Crank Brothers Multi-17 Tool
The Crank Brothers Mini Multi 17 tool has everything you need. It'll fit in your pocket or any seat bag for easy access when you need it.
I used and loved this tool for a few years until I left it on my bikerack and drove off. The only drawbacks are that its a bit heavy and its hard to get a bunch of leverage with the chain tool. Very well built and will last you for years...
Needed a multi-tool to store in my Camelbak and this fit the bill just nicely. Really a nice quality tool.
Has to be my favorite multi tool on the market. Really can do about any trail repair or adjustment needed with this. The chain tool isnt perfect and I find it maxing out sometimes before the pin is pushed far enough out, but i would rather that than accidentally completely releasing the pin. Spoke wrenches can scratch up your rim due to how wide the square piece they are in, but those are both more home repairs than trail.